package org.apache.maven.lifecycle.internal;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.maven.execution.MavenSession;
import org.apache.maven.lifecycle.LifecycleNotFoundException;
import org.apache.maven.lifecycle.LifecyclePhaseNotFoundException;
import org.apache.maven.plugin.InvalidPluginDescriptorException;
import org.apache.maven.plugin.MojoNotFoundException;
import org.apache.maven.plugin.PluginDescriptorParsingException;
import org.apache.maven.plugin.PluginNotFoundException;
import org.apache.maven.plugin.PluginResolutionException;
import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.apache.maven.plugin.prefix.NoPluginFoundForPrefixException;
import org.apache.maven.plugin.version.PluginVersionResolutionException;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.component.annotations.Requirement;
import org.codehaus.plexus.util.StringUtils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * Calculates the task segments in the build
 * 
 * @since 3.0
 * @author Benjamin Bentmann
 * @author Jason van Zyl
 * @author jdcasey
 * @author Kristian Rosenvold (extracted class)
 *         <p/>
 *         NOTE: This class is not part of any public api and can be changed or deleted without
 *         prior notice.
 */

@Component(role = LifecycleTaskSegmentCalculator.class)
public class DefaultLifecycleTaskSegmentCalculator implements LifecycleTaskSegmentCalculator {
  @Requirement
  private MojoDescriptorCreator mojoDescriptorCreator;

  @Requirement
  private LifecyclePluginResolver lifecyclePluginResolver;

  public DefaultLifecycleTaskSegmentCalculator() {
  }

  public List<TaskSegment> calculateTaskSegments(MavenSession session)
      throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
      MojoNotFoundException, NoPluginFoundForPrefixException, InvalidPluginDescriptorException,
      PluginVersionResolutionException, LifecyclePhaseNotFoundException, LifecycleNotFoundException {

    MavenProject rootProject = session.getTopLevelProject();

    List<String> tasks = session.getGoals();

    if (tasks == null || tasks.isEmpty()) {
      if (!StringUtils.isEmpty(rootProject.getDefaultGoal())) {
        tasks = Arrays.asList(StringUtils.split(rootProject.getDefaultGoal()));
      }
    }

    return calculateTaskSegments(session, tasks);
  }

  public List<TaskSegment> calculateTaskSegments(MavenSession session, List<String> tasks)
      throws PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
      MojoNotFoundException, NoPluginFoundForPrefixException, InvalidPluginDescriptorException,
      PluginVersionResolutionException {
    List<TaskSegment> taskSegments = new ArrayList<TaskSegment>(tasks.size());

    TaskSegment currentSegment = null;

    for (String task : tasks) {
      if (isGoalSpecification(task)) {
        // "pluginPrefix:goal" or "groupId:artifactId[:version]:goal"

        lifecyclePluginResolver.resolveMissingPluginVersions(session.getTopLevelProject(), session);

        MojoDescriptor mojoDescriptor = mojoDescriptorCreator.getMojoDescriptor(task, session,
            session.getTopLevelProject());

        boolean aggregating = mojoDescriptor.isAggregator() || !mojoDescriptor.isProjectRequired();

        if (currentSegment == null || currentSegment.isAggregating() != aggregating) {
          currentSegment = new TaskSegment(aggregating);
          taskSegments.add(currentSegment);
        }

        currentSegment.getTasks().add(new GoalTask(task));
      } else {
        // lifecycle phase

        if (currentSegment == null || currentSegment.isAggregating()) {
          currentSegment = new TaskSegment(false);
          taskSegments.add(currentSegment);
        }

        currentSegment.getTasks().add(new LifecycleTask(task));
      }
    }

    return taskSegments;
  }

  public boolean requiresProject(MavenSession session) {
    List<String> goals = session.getGoals();
    if (goals != null) {
      for (String goal : goals) {
        if (!isGoalSpecification(goal)) {
          return true;
        }
      }
    }
    return false;
  }

  private boolean isGoalSpecification(String task) {
    return task.indexOf(':') >= 0;
  }

}